Deuteronomy 19:3-5

Modern English Version

³ You shall prepare a roadway for yourself, and divide the territory of your land into three parts, which the Lord your God is giving you to inherit, so that every manslayer may flee there.

⁴ This is the word concerning the manslayer who will flee there, so that he may live: Whoever kills his neighbor unintentionally, whom he did not hate previously, ⁵ like when a man goes into the forest with his neighbor to cut wood, and his hand raises the axe to cut down the tree, and the axe head slips from the handle and lands on his neighbor causing him to die, then he may flee to one of those cities, and live.